Testing and Characterization of the MPA Pixel Readout ASIC for the Upgrade of the CMS Outer Tracker at the High Luminosity LHC

The Macro Pixel ASIC (MPA) is a readout chip designed for the CMS Outer Tracker upgrades at the High Luminosity LHC (HL-LHC). The MPA’s basic functionalities have already been tested and new research has been done on potential optimizations and the MPA’s response to different stimuli. This paper will examine the effect of the krummenacher feedback and preamplifier bias on the analog performance of the MPA, analyze the response of the MPA when it detects particles from a radioactive source, verify that the process of bump bonding the MPA wafer does not damage the functionality of the chip, and test the radiation hardness of the chip.